from rest_framework import serializers
from .models import User,Address
from django_redis import get_redis_connection
from rest_framework_jwt.settings import api_settings
from celery_tasks .email.tasks import send_verify_mail

class CreateUserSerializer(serializers.ModelSerializer):


    password2 = serializers.CharField(label='确认密码',write_only=True,allow_null=False,allow_blank=False)
    sms_code = serializers.CharField(label='短信验证码',max_length=6,min_length=6,allow_null=False,allow_blank=False,
                                     write_only=True)
    allow = serializers.CharField(label='是否同意协议',allow_null=False,allow_blank=False,write_only=True)

    token = serializers.CharField(label='登录状态token', read_only=True)  # 增加token字段


    class Meta:
        model = User
        fields = ['id','username','password','mobile','password2','sms_code','allow','token']

        extra_kwargs = {
            'username':{
                'min_length':5,
                'max_length':20,
                'error_messages':{
                    'min_length':'仅允许5到20个字符的用户',
                    'max_length':'仅允许5到20个字符的用户',
                }
            },
            'password':{
                'write_only':True,
                'min_length':8,
                'max_length':20,
                'error_messages':{
                    'min_length':'仅允许8到20个字符的用户',
                    'max_length':'仅允许8到20个字符的用户',
                }
            }
        }



    def validate_mobile(self,value):

        import re
        if not re.match(r'1[3-9]\d{9}',value):
            raise serializers.ValidationError('手机号错误')
        return value

    def validate_allow(self,value):

        if value != 'true':
            return serializers.ValidationError('您暂未同意协议')

        return value

    def validate(self,attrs):

        password = attrs.get('password')
        password2 = attrs.get('password2')

        if password != password2:
            raise serializers.ValidationError('密码不一致')

        redis_conn = get_redis_connection('code')

        redis_code = redis_conn.get('sms_%s'%attrs.get('mobile'))

        if redis_code is None:
            raise serializers.ValidationError('验证码已过期')

        if redis_code.decode() != attrs.get('sms_code'):
            raise serializers.ValidationError('验证码错误')

        return attrs

    def create(self, validated_data):

        # 删除多余字段
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']

        user = super().create(validated_data)

        # 修改密码
        user.set_password(validated_data['password'])
        user.save()

        # 补充生成记录登录状态的token
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token = token

        return user

class UserDetailSerializer(serializers.ModelSerializer):
    """
    用户详细信息序列化器
    """
    class Meta:
        model = User
        fields = ('id', 'username', 'mobile', 'email', 'email_active')


class EmailSerializer(serializers.ModelSerializer):
    """
    邮箱序列化器
    """

    class Meta:
        model = User
        fields = ('id','email')
        extra_kwargs = {
            'email':{
                'required':True
            }
        }


    def update(self, instance, validated_data):

        email = validated_data['email']
        instance.email = validated_data['email']
        instance.save()


        # 发送激活邮件
        # 生成激活链接
        verify_url = instance.generate_verify_email_url()
        # 发送,注意调用delay方法
        send_verify_mail.delay(email, verify_url)
        return instance


class AddressSerializer(serializers.ModelSerializer):

    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)
    mobile = serializers.RegexField(label='手机号', regex=r'^1[3-9]\d{9}$')

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')


    def create(self, validated_data):
        #Address模型类中有user属性,将user对象添加到模型类的创建参数中
        validated_data['user'] = self.context['request'].user
        return super().create(validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """
    class Meta:
        model = Address
        fields = ('title',)


from goods.models import SKU
from django_redis import get_redis_connection

class AddUserBrowsingHistorySerializer(serializers.Serializer):
    """
    添加用户浏览记录序列化器
    """
    sku_id = serializers.IntegerField(label='商品编号',min_value=1,required=True)

    def validate_sku_id(self,value):
        """
        检查商品是否存在
        """
        try:
            SKU.objects.get(pk=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')

        return value

    def create(self, validated_data):

        #获取用户信息
        user_id = self.context['request'].user.id
        #获取商品id
        sku_id = validated_data['sku_id']
        #连接redis
        redis_conn = get_redis_connection('history')
        #移除已经存在的本记录
        redis_conn.lrem('history_%s'%user_id,0,sku_id)
        #添加新的记录
        redis_conn.lpush('history_%s'%user_id,sku_id)
        #保存最多5条记录
        redis_conn.ltrim('history_%s'%user_id,0,4)
        return validated_data


class SKUSerializer(serializers.ModelSerializer):

    class Meta:
        model = SKU
        fields = ('id', 'name', 'price', 'default_image_url', 'comments')

